I run Michelin XPS Rib truck tires on my toy hauler. The tires are 5 years old and I've never run max psi in them, usually around 70 psi. The way I see it, my truck runs 70 front and 65 rear per the sticker, not the max pressure on the sidewall. My car runs 30 psi per the sticker, not the max pressure in the sidewall. I don't run max psi on my Harley. Why should my trailer be any different? Well built tires don't need to be babied for fear of exploding from heat, which is why I'll never buy trailer tires.
The trailer tire people say to run max air in the Chinese-made tires because they are total junk and will fail if they get much above room temperature. :)